Lyra Ring Nebula M57(NGC6720)

 Date and Time    : 1999.7.31 22:14
 Optical Equipment: CELESTRON D9inch/f2,350mm/F10 Shumit Cassegrain 
                    + VIXEN GP equatrial with SKY SENSOR2000PC. 
                    Direct Focus.
 Camera           : Cooled CCD (SBIG ST-7) -0.0deg.C 
 Filters          : SBIG IR coated filters R, G, B
                    SBIG Automatic Filter Wheel CWF8
 Exposure Time    : R:60sec. G:90ec. B:120sec.
 Pinning          : L:1X1, R:1X1, G:1X1, B:1X1
 Graphic Process  : Processed with "Photo Shop".


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